The question did not state a specific problem for us to answer on Stack Overflow; rather, the OP was looking for feedback to improve their code. In that way the question was a better fit for CR than it was for SO.

Had the OP included specific profiling information and a more detailed outline of where the problem with the code lay, it could perhaps be fit for SO too.

Note however that the SO community is (far, far) larger than just me, so my 'off-topic' vote is just one opinion. If others agreed and followed up with votes, the question would have been migrated by a moderator had he or she left it on SO.

The question wasn't mine. You make a good point, but perhaps you could ask for profiling information in a comment to the question.
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Lev LevitskyJun 17 '12 at 14:11

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Are plain "how can I make this faster" questions really welcome on Code Review though? I'm not familiar with the site, so I really don't know.
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PëkkaJun 17 '12 at 14:40

@Pekka: The CR FAQ includes "feedback on a specific working piece of code from your project in the following areas... [...] * Performance".
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Martijn PietersJun 17 '12 at 14:42

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I find it strange that a question that is on topic for CR can be changed into an on-topic SO question just by expanding it with relevant info. It sounds like CR is a place for bad questions about performance, and SO is a place for good ones.
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Lev LevitskyJun 17 '12 at 14:55

@Lev yeah, that's why I was unsure, too. But if the folks over at CR are okay with that... shrug
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PëkkaJun 17 '12 at 15:03